<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<link rel="stylesheet" href="my.css" />
		<style>
			.name1 {
				color: red;
			}
			
			.name2 {
				text-decoration: underline;
			}
			
			.name3 {
				font-size: 50px;
			}
			
			.neilian {
				font-size: 25px;
			}
		</style>
	</head>

	<body>
		<p class="name1 name3">段落1</p>
		<p class="name2 name1">段落2</p>
		<p class="name3 name2">段落3</p>
		<p style="font-size: 25px ; color: red;">使用内联样式</p>
		<h1 class="neilian name1">使用内部样式表</h1>
		<h2 class="lanse">使用外部样式表</h2>
	</body>

</html>